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refactor: 架构升级
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# cover-view
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## Instructions
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覆盖在原生组件上的文本视图。
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app-vue和小程序框架,渲染引擎是webview的。但为了优化体验,部分组件如map、video、textarea、canvas通过原生控件实现,原生组件层级高于前端组件(类似flash层级高于div)。为了能正常覆盖原生组件,设计了cover-view。
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平台差异说明
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### Syntax
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- 使用 `<cover-view />`(或 `<cover-view></cover-view>`,当需要包裹子节点时)。
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- 遇到平台差异时,建议使用条件编译(`#ifdef / #endif`)显式处理。
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#### Properties
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| 属性名 | 类型 | 默认值 | 说明 | 平台差异说明 |
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| --- | --- | --- | --- | --- |
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| scroll-top | number/string | | 设置顶部滚动偏移量,仅在设置了 overflow-y: scroll 成为滚动元素后生效 | 支付宝小程序不支持 |
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#### Events
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See official docs for full events list: `https://uniapp.dcloud.net.cn/component/cover-view.html`
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#### Platform Compatibility
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See official docs for platform support table: `https://uniapp.dcloud.net.cn/component/cover-view.html`
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### Examples
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Examples are available in the official docs: `https://uniapp.dcloud.net.cn/component/cover-view.html`
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Reference: [Official Documentation](https://uniapp.dcloud.net.cn/component/cover-view.html)
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